Yes it is normal. Typically with higher the radio frequency at the same
power level as a lower frequency signal environmental things like walls
and furniture cause a weaker signal on the higher frequency for the same
range.

My phone let's me manually connect to either SSID. The Roku & tablet
won't even see the 5GHz SSID. When the phone is connected to 5GHz
a program called Fing can see the Roku & tablet even when they're
connected to the 2.4GHz SSID.

The tablet & Roku are supposed to be 802.11n.

Is there a program to tell me if I'm actually connected to G, N, B or
whatever?

On 11/16/2015 7:47 PM, Dusty wrote:
Yes the N standard can switch between between 2.4 and 5Ghz provided the
router is configured to allow it, which is usually the default.

Most routers do allow you to lock it at a specific frequency. In your
case it sounds like you might do better to go into the router and try
locking it at 2.4 or the G standard. That should make your existing
equipment operate a little smoother together.

Unfortunately none of my PC's or phones work in the 5Ghz band so I can't
provide more definite info.